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  <title>绝对定位应用</title>
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  <link rel="stylesheet" href="css/abs.css">
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  <div class="border-box box01">绝对定位参照</div>
  <div>
    <div class="border-box box02">
      不受约束的绝对定位
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  <div class="border-box box03">
    <div class="border-box box04">
      相对受约束的绝对定位
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  <div class="border-box box05">
    <div>1</div>
    <div>2</div>
    <div>3</div>
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  <div class="border-box box06">
    <div>内容随意编写</div>
    <div>99</div>
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  <div class="border-box box07">
    <div>内容层<br>哈哈哈哈<br>嘻嘻嘻</div>
    <div>完全遮挡层</div>
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